The correct option is Submit a set of commits for review and potential merge into the target branch.

A pull request is designed to propose changes so the team can examine the diff, discuss the approach, run checks, and then merge when the work meets the project standards. It collects the commits from the feature branch into a single reviewable request, which streamlines feedback and approvals before integration into the default branch.

Create an issue to track a defect or enhancement is incorrect because issues are used to plan and track work or report problems, while a pull request is used to review and merge code changes.

Fork the repository into your own account is incorrect because forking creates a separate copy of the repository. You might open a pull request from a fork, but the act of forking is not the purpose of a pull request.

Set up a Cloud Build trigger for continuous integration is incorrect because configuring a CI trigger is a separate automation task. A pull request may trigger CI checks, but opening one is primarily for proposing changes for review and possible merge.

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